Meteor.js is a full-stack JavaScript platform that simplifies web application development by allowing developers to use a single codebase for both the client and server sides. It provides an integrated set of technologies, including real-time data updates, a reactive templating engine, and a built-in package management system, streamlining the process of building modern and scalable web applications.
Svelte is a modern front-end framework that compiles your code at build time, resulting in smaller and faster applications. It uses a reactive approach to update the DOM, allowing for high performance and a smoother user experience.